Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: 2019x – 1 + 2020 x ( 1-2019x) = 0

Toán Lớp 8: 2019x – 1 + 2020 x ( 1-2019x) = 0

Comments ( 2 )

  1. Giải đáp:
    x=\frac{1}{2019} hoặc x=\frac{1}{2020}
    Lời giải và giải thích chi tiết:
    2019x-1+2020x(1-2019x)=0
    ⇔ -(1-2019x)+2020x(1-2019x)=0
    ⇔ (1-2019x)(2020x-1)=0
    ⇔ $\left [\begin{array}{l} 1-2019x=0 \\ 2020x-1=0 \end{array} \right.$
    ⇔ $\left [\begin{array}{l} 2019x=1 \\ 2020x=1 \end{array} \right.$
    ⇔ $\left [\begin{array}{l} x=\dfrac{1}{2019} \\ x=\dfrac{1}{2020} \end{array} \right.$

  2. $2019x – 1 + 2020x( 1-2019x) = 0$
    $⇔(2019x – 1) – 2020 x ( 2019x-1) = 0$
    $⇔(1-2020x)(2019x – 1) = 0$
    $⇔$\(\left[ \begin{array}{l}1-2020x=0\\2019x – 1 = 0\end{array} \right.\)
    $⇔$\(\left[ \begin{array}{l}1=2020x\\2019x=1\end{array} \right.\)
    $⇔$\(\left[ \begin{array}{l}\dfrac{1}{2020}\\\dfrac{1}{2019}\end{array} \right.\)
    Vậy $x=\dfrac{1}{2020}$ hoặc $\dfrac{1}{2019}$.

Leave a reply

222-9+11+12:2*14+14 = ? ( )

About Lyla Anh